General Description
About TMC2074
The TMC2074 network controller is CircLink technology’s flagship product. The TMC2074’s flexibility and rich feature set enable a high-reliability and high-performance, real-time and control-oriented network without the cumbersome middle layer protocol stacks and complex packet prioritization schemes typically required.
TMC2074 operates at network data transfer rates up to 5 Mbps. Its embedded 1 kByte RAM can be configured into a maximum of 32 pages to implement a 31-node network where each node in the network has the same local memory.

PRODUCT FEATURES
• Low Power CMOS, 3.3 Volt Power Supply with 5 Volt Tolerant I/O
• Supports 8/16-Bit Data Bus
   − Both 86xx and 68hxx Platforms
• 1K On-chip Dual Port Buffer Memory
   − Sequential I/O Mapped Access
• Enhanced Token Passing Protocol from ARCNET
   − Maximum 31 Nodes per Network
   − Token Retry Mechanism
   − Maximum 256 Bytes per Packet
   − Consecutive Node ID Assignment
• Memory Mirror
   − Shared Memory within Network
• Network Standard Time
   − Network Time Synchronization
   − Automatic Time Stamping
• Coded Mark Inversion
   − Intelligent 1-Bit Error Correction
   − Magnetic Saturation Prevention
• Dual Operation Modes
   − Peripheral (Host) Mode Operates with MCU
   − Standalone (I/O) Mode Operates without MCU
• Supports 8 Bit Programmable General Purpose I/O at peripheral Mode
• Supports 16 Bit Input and 16 Bit Output at Standalone Mode
• Dual Communication Modes (with Peripheral Mode)
   − Free Format Mode
   − Remote Buffer Mode
• 3 Port Hub Integrated
   − 1 Internal and 2 External
• Flexible Topologies
   − Bus, Star and Tree
• Low Cost Media can be Used
   − RS485 Differential Driver
• Fiber Optics and Twisted Pair Cable Supported
• 128-Pin VTQFP Package; Green, Lead-free Package also Available
• Temperature Range from 0 to 70 Degrees C